FlashMessageService.php

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<?php
namespace TYPO3\CMS\Core\Messaging;

class FlashMessageService implements \TYPO3\CMS\Core\SingletonInterface {

    protected $flashMessageQueues = array();

    public function getMessageQueueByIdentifier($identifier = 'core.template.flashMessages') {
        if (!isset($this->flashMessageQueues[$identifier])) {
            $this->flashMessageQueues[$identifier] = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
                'TYPO3\CMS\Core\Messaging\FlashMessageQueue',
                $identifier
            );
        }
        return $this->flashMessageQueues[$identifier];
    }
}